Macro L_cuserid missing in /usr/include/stdio.h in F17 ?

[Joachim Backes]

The man page of getlogin(3) says that L_cuserid is  declared  in
<stdio.h>. But if I try to compile (gcc-4.7.0-5.fc17.x86_64) a little
source using L_cuserid

#include <unistd.h>
#include <stdio.h>
main () {
fprintf (stderr,"L_cuserid = %d",L_cuserid);
}


I get an error:

x.c: In function ‘main’:
x.c:4:34: error: ‘L_cuserid’ undeclared (first use in this function)
x.c:4:34: note: each undeclared identifier is reported only once for
each function it appears in

The source compiles correctly if I use -D_XOPEN_SOURCE

Kind regards

-- 
Joachim Backes <joachim.backes at rhrk.uni-kl.de>

https://www-user.rhrk.uni-kl.de/~backes

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